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Method for preparing potassic fertilizer by using high temperature steel slag or high temperature blast furnace slag and potash feldspar

A technology for potassium feldspar and blast furnace slag is applied in the field of solid waste utilization and refractory mineral resource utilization, and can solve the problems of unavailability of thermal energy and high energy consumption of potassium feldspar

Active Publication Date: 2010-02-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the thermal energy in the current high-temperature steel slag and high-temperature blast furnace slag cannot be utilized, and the high-temperature decomposition of potassium feldspar also consumes too much energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Crush 1 ton of potassium feldspar to a particle size of 0.2 to 0.5 mm, and mix it with 1 ton of calcium sulfate (potassium feldspar KAlSi 3 o 8 The molar ratio of calcium sulfate and calcium sulfate is 1:2), and then put into the container together with 5 tons of blast furnace slag at 1400 ° C, and use the heat of blast furnace slag to treat the mixture of potassium feldspar and additives for 2 hours, and then use water for leaching, water The solid mass ratio is 5:1, and the compound fertilizer containing K, Ca and Mg is obtained after evaporating and crystallizing the leaching solution, and the leaching rate of potassium in the potassium feldspar is 80%.

Embodiment 2

[0016] Grind 1 ton of potassium feldspar to a particle size of 0.1-0.2 mm, and mix it with 5.45 tons of calcium carbonate (potassium feldspar KAlSi 3 o 8 The molar ratio of calcium carbonate and calcium carbonate is 1:15), and then put into the container together with 10 tons of blast furnace slag at 1550°C, and use the heat of blast furnace slag to treat the mixture of potassium feldspar and additives for 3 hours, and then use water for leaching, water The solid mass ratio is 9:1, and the compound fertilizer containing K, Ca and Mg is obtained after evaporating and crystallizing the leaching solution, and the leaching rate of potassium in potassium feldspar is 88%.

Embodiment 3

[0018] 10 tons of potassium feldspars are crushed to a particle size of 0.05-0.1mm, mixed with 16.1 tons of calcium chloride (potassium feldspar KAlSi 3 o 8 The molar ratio of calcium chloride and calcium chloride is 1:4), and then sent into the container together with 20 tons of steel slag at 1700 °C, and the mixture of potassium feldspar and additives was treated with the heat of steel slag for 2 hours, and then water was used for leaching. The mass ratio is 6:1, and the compound fertilizer containing K, Ca and Mg is obtained after evaporating and crystallizing the leaching solution, and the leaching rate of potassium in potassium feldspar is 73%.

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Abstract

The invention relates to a method for preparing potassic fertilizer by using high temperature steel slag or high temperature blast furnace slag and potash feldspar. The method comprises the followingsteps of: using high temperature steel slag or high temperature blast furnace slag as heat source, processing potash feldspar by using CaO and MaO therein and extra assistant, destroying lattice structure of the potash feldspar, causing potassium ions therein to be extracted by a leaching method, thus obtaining the potassic fertilizer. As silicon oxide and aluminium oxide in potash feldspar reactwith calcium elements in the assistant to generate matters such calcium silicate, calcium aluminate and the like, solid slag can be used for generating cement, steel slag micro powder, serves as roadengineering material or refilling material, asphalt concrete aggregate or is used for producing microcrystalline glass after the potassium is extracted.

Description

technical field [0001] The invention relates to a method for preparing potassium fertilizer by using high-temperature steel slag or high-temperature blast furnace slag and potassium feldspar, and belongs to the technical field of solid waste utilization and refractory mineral resource utilization. Background technique [0002] The iron and steel industry has always been a major energy consumer in my country due to the large number of operations involving high temperature, smelting and sintering. In order to reduce energy consumption and achieve a sustainable development strategy, the utilization of waste heat in the iron and steel industry has been concerned by many scholars. Among them, the utilization of waste heat from high-temperature steel slag produced in the steelmaking process is the focus and difficulty of this research. The reason why it has become a hot spot is that the temperature of steel slag is extremely high when it comes out of the furnace, generally at 150...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05D1/00C05D1/04B09B3/00
Inventor 刘海弟吴镇江魏连启岳仁亮陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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